Eyeglasses



UNITED' STATES PATENT OFFICE.,

IVANFOX, OF PHILADELPHIA, PENNSYLVANIA.

EYEGLASSES.

R.5PIECIFICATION forming part of Letters Patent No. 358,118, datedFebruary' 22, 1887.

Appliration filed March 20, 1886. Serial No. 195,904. (No model.)

To all 'whom it may concern:

Be it known that I, IVAN FOX, a citizen of the United States, residingin the city and county of Philadelphia, in the State of Pennsylvania,have linvented an Improvement in Eyeglasses, of which the following is aspecification.

This invention is an improvemeut upon an eyeglass-frame invented by me,and patented to me in and by Letters Patent of the United States, No.296,826, granted April 15, 1884, to which Letters Patent reference is tobe made for a better understanding of my improvements. i

In eyeglasses it is a desideratnm that the major axis of each ellipticallens should,when the glasses are in place upon the nose, occupy ahorizontal position, and this is especially important to those wearinglenses known as cylinders77- and employed for the correction ofastigmatism, and it is also a desideratum that beyond a certain distancethe spring should not too readily expand and the lenses separate orspread apart. The ordinary elli ptic one-piece springs employed toconnect the two lenses, being connected with the latter or with theirframes at but a single point,expand very readily, and when upon the nosefrequently permit the major axis of each lens to incline upward at theonter end, as shown in Figure 3 of the drawings. To obviate thistendency of the ordinary spring, I devised the spring shown anddescribed in my Letters Patent No. 296,826 above referred to. Areference to the foregoing patent will, however, make manifest that thetwo separate reverselycurved springs O, which it is necessary to.

employ, are connected to the yoke D at such an angle and in such amanner that the constant spreading apart of the lenses in theirapplication to the nose will have a tendency to separate or loosen theunion between the outer ends of said reversely-curved Springs' and saidyolre.

The object of the present invention is to obviate the employment ofreversely-curved springs in connection with an overhangingconnecting-yoke and to secure a union of the advantages derived from theuse of the oldfashioned elliptic uniting-spring, of the character shownin Fig. 3, and of the overhanging yoke, of the character set forth in myforegoing patent; and these objects I attain` by a construction, aconvenient form of a good embodiment of which is represented in Figs. 1,2, 4, 5, and 6 of the accompauying drawings described in thisspecification, and hereinafter claimed.

In the accompanying drawings, Fig. 1 is a face view of a pair ofeyeglasscs embodying my invention in the position which theparts occupybefore application to the nose. Fig. 2 is a view similar to Fig. l ofthe same glasses in the position which they occupy when applied tojhenose, and in this position it will be observed that the overhangng lugsupon the spring encounter the lens-frames when the maj or axes arehorizontal,andtherebypreventfurtherupward deflection of the outer endsof said aXes. Fig. 3 is a front view of a pair of eyeglasses equippedwith an old-fashioned spring without the overhanging lugs, showing thetendency of the lenses to an eXcessive upward set. Figs. 4, 5, and 6 arefront elevational details of different constructions of my improvement.

Similar letters of reference vindicate corresponding parts.

In the drawings, A represents the lenses, which may be of any desiredShape, and a the metalrim or frame containing the same,which, however,may be dispensed with.

B is the elliptic connecting-spring, which is connected either .with therims or frames of the lenses, or by any usual method direct with thelenses themselves. The spring is provided with two overhanging lugs orprojections, b, which const-itute abutments or stops for the lenses orlens-frames, and which subserve'all the purposes of the connected endsof the reversely-curved springs and yoke of my former patent.

The object of the device being, as stated, to, in effect, retain theold-fashioned elliptic connecting-spring and at the same time provide itwith abutments to prevent excessive upward defiection of the lenses, itis obvious that different modes of construction may be re- Vsorted to.Thus in the construction shown in posed of three pieces of metal, theyoke or oonnecting member of which is integral with the overhanginglugs, stops, or abutments.

In Fig. 4 the spring' is eonlposed of a single continuous piece ofmetal, while the stops or abutments are likewise eomposed of a singlepiece brazed to the spring.

In Fig. 5 the spring is composed of but a single pieee of metal, whilethe overhanging ends, stops, or abutnients are two separate piecesseparately brazed on.

Finally, in Fig. (the spring` is composed of three pieces, and the stopsor abutments are two separate pieces of metal applied in the mannershown.

The union between the parts of the spring and its abutments may beeffeetuated by sol dering, brazing, riveting, or otherwise, asconvenience of manufactnre may dictate.

from the upper edges of said lenses, substan- 30 tially as and for thepurposes set forth.

In testimony whereof I have hereunto signed my name this 3d day ofMarch, A. D. 1886.

IVAN FOX.

In presence of- J. BoNsALL TYLOR, WM. O. STRAWRIDGE.

